You could set them as environment variables and use shell commands to loop over them, e.g. (Linux shell syntax, might be different on other platforms):

steps:
  - name: run loop
    env:
      FILES: a.scss b.scss
    run: for f in $FILES; do [YOUR COMMAND HERE]; done

Though I think it might be better to use a build tool (e.g. make or whatever else suits your project) for this, or to add a script to your repository that does the processing based on parameters or even automatically discovered input.

I’m not sure how you compile the scss files into css, but ‘jobs.<job_id>.strategy.matrix’ could be an option for you.

im using:

- name: Sass Build
        uses: gha-utilities/sass-build@v0.1.6

to build it

using this, how would i call a github action using a consle command?

Perfect, thank you!

what language it is for “for” loop?

for f in $FILES; do [YOUR COMMAND HERE]; done

I guess you mean this? That’s sh (Unix/Linux shell). By default run: commands run in such a shell on Linux runners.